American Water Heater NonCondensing UltraLow NOx Outdoor Natural Gas GT110UNE user manual

							
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Models
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037B0003310U 
037B0003510U 
037B0003110U 
037B0003310U 
037B0003510U U-IN\)
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							2   Page
CONTENTS
Installation Manual
　SPECIFICATIONS ........................................................................\
..................................................4
　INTRODUCTION ........................................................................\
..................................................5
　SAFETY GUIDELINES ...................................................................................................................\
.6
　INSTALLATION ........................................................................\
.....................................................7
　　General.....................................................................................................................................7
　　Clearances.......................................................................\
.........................................................9
　　Included accessories.............................................................\
...................................................9
　　Optional items..........................................................................................................................9
　　Warning for installations........................................................................................................11
　　High-altitude installations........................................................................\
..............................12
　　Venting instructions...............................................................................................................13
　　Gas supply and gas pipe sizing...............................................................................................18
　　Water connections................................................................................................................20
　　Electrical connections...........................................................................................\
.................21
　　Temperature remote controller............................................................................................22
　　Easy-Link System........................................................................................\
............................25
　　Multi-Unit System..................................................................................................................29
　APPLICATIONS......................................................................................................................\
......30
　INITIAL OPERATION..............................................................................................................\
.....32
Owner's Guide
　OPERATING SAFETY ..................................................................................................................\
34
　NORMAL OPERATION ...............................................................................................................36
　　General........................................................................................................................\
..........36
　　Temperature settings.............................................................................................................37
　　Flow........................................................................\
...............................................................40
　　Freeze protection system.......................................................................................................40
　　Maintenance and service.......................................................................................................41
　　Unit draining and filter cleaning............................................................................................41
　TROUBLESHOOTING...................................................................................................................42
　　General...................................................................................................................................42
　　Error codes................................................................................................................\
............44
　COMPONENTS DIAGRAM...........................................................................................................47
　PARTS LIST..................................................................................................................................51
　OUTPUT TEMPERATURE CHART.............................................................................\
.......................54
　LIMITED WARRANTY..................................................................................................................55
Contents  
						

							3    Page
Installation Manual
Installation Manual
CONGRATULATIONS
Congratulations and thank you for choosing our tankless water heater. 
Before use, we recommend that you read through this safety manual 
carefully.  Please refer to the back of the manual for details about the 
warranty.  Keep this manual for future reference.
If you lose the manual, contact the manufacturer or your local 
distributor.  When you call, please tell us the product name and the 
serial number of your unit written on the rating plate of the water 
heater.  
						

							4   Page
Model
110U
 Indoor
(T-KJr2U-IN)
110U 
Outdoor
(T-KJr2U-OS)
310U 
Indoor
(T-K4U-IN)
310U 
Outdoor
(T-K4U-OS)
510U 
Indoor
(T-D2U-IN)
510U 
Outdoor
(T-D2U-OS)
Natural Gas Input 
(Operating Range)BTU/hMin.: 15,000  
Max.: 140,000
Min.: 15,000  
Max.: 190,000
Min.: 15,000  
Max.: 199,000
Gas Connection3/4" NPT
Water Connections3/4" NPT
Water Pressure*psi
(Mpa)15 - 150 (0.1 - 1)
Natural gas
Inlet Pressure
" W.C.
(kPa)
Min. 5.0 (1.24)
Max. 10.5 (2.61)
Manifold 
Pressure**
Natural
Gas
" W.C.
(Pa)
1.8
(448)
1.5
(373)
3.0
(747)
2.9
(722)
3.2
(796)
3.05
(759)
Weightlbs. (kg)37 (16.9)39 (17.9)
DimensionsinchH 20.5 x W 13.8 x D 8.5
H 520 x W 351 x D 216mm
IgnitionElectric Ignition
Electric
SupplyVAC / Hz120 / 60
Consumption
OperationW / A52.1 / 0.5475.8 / 0.8381.6 / 0.86
StandbyW / A5.4 / 0.085.5 / 0.086.5 / 0.09
Freeze-
ProtectionW / A131 / 1.1131 / 1.1132 / 1.1
SPECIFICATIONS
*The maximum flow may need water pressure equal to or above 40 psi.
** The Manifold Pressure is the factory setting and generally should not need adjustment.
NOTE:
•	 Check	 the	rating	 plate	to	ensure	 this	product	 matches	 your	specifications.
•	 In	 accordance	 with	ANSI	 Z21.10.3,	 CO	emission	 does	not	exceed	 400	PPM	 for	normal	 input.
•	The manufacturer reserves the right to discontinue, or change at any time, specifications or designs 
without notice and without incurring obligations.
Specifications
Installation Manual  
						

							5  Page
INTRODUCTION
•	This manual provides information necessary for the installation, operation, and maintenance 
of the water heater.
•	The model description is listed on the rating plate which is attached to the side panel of the 
water heater.
•	Please read all installation instructions completely before installing this product.
•	If you have any problems or questions regarding this equipment, consult the manufacturer or 
its local representative.
•	This equipment is an on-demand, tankless water heater designed to efficiently supply endless 
hot water for your needs.
•	The 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models 
are only to be installed indoors (direct-vent (double vent) convertible). The 110U Outdoor 
(T-KJr2U-OS), 310U Outdoor (T-K4U-OS) and 510U Outdoor (T-D2U-OS) models are only to be 
installed outdoors.
•	The principle behind tankless water heaters is simple:
 
 *This diagram illustrates tankless water heater design concepts only and does not accurately 
       represent the water heater’s physical description.
1. A hot water tap is turned on.
2. Water enters the heater.
3. The water flow sensor detects the water flow.
4. The computer initiates the fan motor and sends a signal to the igniter to create an ignition spark.
5. The gas ignites and flames appear within the burner chamber.
6. Water circulates through the heat exchanger and then gets hot.
7. Using thermistors to measure temperatures throughout the water heater, the computer modulates 
the gas and water valves to ensure proper output water temperature.
8. When the tap is turned off, the unit shuts down.
Burners
Exhaust vent collar
Heat exchanger
Gas valves
Fan motor
Flow adjustment valve
Computer board
Thermistor
Cold water inletHot water outlet
Gas inletThermistor
Burners
Flow sensor
Introduction
Installation Manual  
						

							6  Page
SAFETY GUIDELINES
SAFETY DEFINITION
GENERAL
   1.  Follow all local codes, or in the absence of local codes, follow the most recent edition of the National
							Fuel	 Gas	Code:		 ANSI	Z223.1/NFPA	 54	in	the	 USA	 or	CAN/CSA	 B149.1	Natural	 Gas	Installation	 Code	
       in Canada.
   2.  Properly ground the unit in accordance with all local codes or in the absence of local codes, with the
        National Electrical Codes:  ANSI/NFPA 70 in the USA or CSA standard C22.1 Canadian Electrical Code 
        Part 1 in Canada.
   3.  Carefully plan where you intend to install the water heater. Please ensure:
													•			Your	 water	 heater 	will	 have	 enough	 combustible	 air	and	 proper	 ventilation.
													 •			Locate	 your	heater	 where	water	leakage	 will	not	damage	 surrounding	 areas.	(Please	 refer	to		
                  p. 8.)
   4.  Check the rating plate for the correct GAS TYPE, GAS PRESSURE, WATER PRESSURE and ELECTRIC
        RATING.
     *If this unit does not match your requirements, do not install and consult with the manufacturer.
   5.  If any problem should occur, turn off all hot water taps and turn off the gas. Then call a trained
        technician or the Gas Company or the manufacturer.
WARNING
•	Water temperatures over 125 °F (52 °C) can cause severe burns instantly or 
death from scalding.  The water temperature is set at 120 °F (50 °C) from the 
factory to minimize any scalding risk. Before bathing or showering always 
check the water temperature.
•	Do not store or use gasoline or other flammables, vapors, or liquids in the 
vicinity of this appliance.
•	Do not reverse the water and/or gas connections as this will damage the gas 
valves and can cause severe injury or death.  Follow the diagram on p. 20 
when installing your water heater.
•	Do not use this appliance if any part has been in contact with or been 
immersed in water.  Immediately call a licensed plumber, a licensed gas 
fitter, or a professional service technician to inspect and/or service the unit if 
necessary.
•	Do not disconnect the electrical supply if the ambient temperature will drop 
below freezing.  The Freeze Protection System only works if the unit has 
electrical power.  The warranty will not be covered if the heat exchanger 
is damaged due to freezing.  Refer to the section on the Freeze Protection 
System on p. 40 for more information.
WARNING
Indicates an imminently hazardous situation which, if not avoided, could result 
in death or serious injury.
CAUTION
Indicates an imminently hazardous situation which, if not avoided, could result 
in minor or moderate injury.
Safety Guidelines
Installation Manual
Indicates an imminently hazardous situation which, if not avoided, will result in 
death or serious injury.
DANGER  
						

							7  Page
INSTALLATION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the most recent edition of the National 
Fuel	 Gas	Code:	 ANSI	Z223.1/NFPA	 54	in	the	 USA	 or	CAN/CSA	 B149.1	Natural	 Gas	Installation	 Code	in	
Canada.
2. All gas water heaters require careful and correct installation to ensure safe and efficient operation.  
This manual must be followed exactly.  Read the “Safety Guidelines” section.
3. The manifold gas pressure is preset at the factory.  It is computer controlled and should not need 
adjustment.
4. Maintain proper space for servicing. Install the unit so that it can be connected or removed easily. 
Refer to the "Clearances" section on p. 9 for proper clearances.
5. The water heater must be installed in a location where the proper amount of combustible air will be 
available to it at all times without obstructions.
6. The electrical connection requires a means of disconnection, to terminate power to the water heater 
for servicing and safety purposes.
7. Do not install the unit where the exhaust vent is pointing into any opening in a building or where the 
noise may disturb your neighbors.  Make sure the vent termination meets the required distance by 
local code from any doorway or opening to prevent exhaust from entering a building. (Refer to p. 14.)
8. Particles from flour, aerosols, and other contaminants may clog the air vent, build up and reduce 
the functions of the rotating fan, cause improper burning of the gas, or cause damage to the water 
heater.  Regularly ensure that the area around the unit is dust- or debris-free.  Regular maintenance is 
recommended for these types of environment.
9.  For the 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models:
•	These units may be converted to a direct-vent (sealed combustion) appliance by installing 
a direct-vent conversion kit Part No. 9007667005 (TK-TV10) which will bring in all required 
combustible air from outside the building.  When installing the direct-vent conversion kit, please 
follow all instructions included with the kit.
•	If the water heater is used as a direct-vent appliance, the unit requires a 3 in. (76 mm) 
combustible air supply pipe.  The intake pipe must be sealed airtight.  Air supply pipe can be 
made of ABS, PVC, CPVC, Polypropylene, corrugated stainless steel, or Category lll / IV stainless 
steel.
•	Terminating the venting through a sidewall is recommended for the direct-vent system.
•	Running the exhaust vent and the intake pipe parallel is recommended.
•	Terminating the exhaust and intake on the same wall/surface is recommended.  Terminating in 
the same pressure zone allows for pressure balancing, which prevents nuisance shutdowns.
10.  The 110U Outdoor (T-KJr2U-OS), 310U Outdoor (T-K4U-OS) and 510U Outdoor (T-D2U-OS) models
      only to be installed outdoors and only in the area with mild, temperate climates.
Installation
Installation Manual  
						

							8  Page
•	Installation and service must be performed by a qualified installer (for 
example, a licensed plumber or gas fitter), otherwise the warranty will be 
void.
•	The installer (licensed professional) is responsible for the correct installation 
of the water heater and for compliance with all national, state / provincial, 
and local codes.
•	The manufacturer does not recommend installing the water heater in a pit or 
location where gas and water can accumulate.
•	Do not have the vent terminal pointing toward any operating window, door, or 
opening into a building.
•	Do not install next to any source of airborne debris, such as a clothes dryer, 
that can cause debris to be trapped inside the combustion chamber, unless the 
system is direct-vented.
•	The manufacturer does not recommend installing the water heater in an attic 
due to safety issues.  If you install the water heater in an attic:
•	Make sure the unit will have enough combustion air and proper 
ventilation.
•	Keep the area around the water heater clean.  When dust collects on the 
flame sensor, the water heater will shut down on an error code.
•	If the above conditions cannot be met, use the direct-vent conversion kit 
Part No. 9007667005 (TK-TV10).
•	Place the unit for easy access for service and maintenance.
•	A drain pan, or other means of protection against water damage, is 
required to be installed under the water heater in case of leaks.
WARNING
•	The warranty will not cover damage caused by water quality.
•	Only potable water or potable water / glycol mixtures can be used with 
this water heater.  Do not introduce pool or spa water, or any chemically 
treated water into the water heater.
•	Water hardness levels must not exceed 7 grains per gallon (120 ppm) for 
single family domestic applications or more than 4 grains per gallon (70 
ppm) for all other types of applications.  Water hardness leads to scale 
formation and may affect / damage the water heater.  Hard water scaling 
must be avoided or controlled by proper water treatment.
•	Water pH levels must be between 6.5 and 8.5
•	Well water must be treated.
•	Do not install the unit where water, debris, or flammable vapors may get into 
the flue terminal.
•	The manufacturer recommends using the direct-vent kit when the water 
heater is installed in a beauty salon.  Some chemicals used in a beauty salon 
may affect the flame sensor.  Water heater may not work properly.
•	Although the water heater is designed to operate with minimal sound, the 
manufacturer does not recommend installing the unit on a wall adjacent to a 
bedroom, or a room that is intended for quiet study or meditation, etc.
•	Locate your heater close to a drain where water leakage will not do damage 
to surrounding areas.  As with any water heating appliance, the potential for 
leakage at some time in the life of the product does exist.  The manufacturer 
will not be responsible for any water damage that may occur.  If you install a 
drain pan under the unit, ensure that it will not restrict the combustion air flow.
CAUTION
Installation
Installation Manual  
						

							9    Page
To p
Back
Bottom
Side
Side
Front
Maintain all clearances around 
the water heater.
CLEARANCES
ModelTo pBottomFrontBackSides
110U Indoor (T-KJr2U-IN)*310U Indoor (T-K4U-IN)*510U Indoor (T-D2U-IN)*
12 in.
(305 mm)
12 in.
(305 mm)
4 in.**
(102 mm)
0.5 in.
(13 mm)
3 in.
(76 mm)
110U Outdoor (T-KJr2U-OS)310U Outdoor (T-K4U-OS)510U Outdoor (T-D2U-OS)
36 in.
(914 mm)
12 in.
(305 mm)
24 in.
(610 mm)
0.5 in.
(13 mm)
3 in.
(76 mm)
*Standard indoor installations and direct-vent indoor installations have the same clearances.
**24 inches recommended for maintenance.
OPTIONAL ITEMS
#Model
110U Indoor(T-KJr2U-IN)
110U Outdoor(T-KJr2U-OS)
310U Indoor(T-K4U-IN)
310U Outdoor(T-K4U-OS)
510U Indoor(T-D2U-IN)
510U Outdoor(T-D2U-OS)
1.4" Backflow preventer and F-F adaptor✓✓✓
2.Direct-vent conversion kit✓✓✓
3.Pipe cover✓✓✓✓✓✓
4.Recess box✓✓✓
5.Sidewall vent terminator (Hood) and Wall thimble✓✓✓
6.Direct-vent concentrictermination✓✓✓
7.Remote controller for high temperature mode✓✓
INCLUDED ACCESSORIES
Installation
Installation Manual
Check that these items below are included with the water heater.
   Installation manual 
    and Owner’s guide
  Temperature 
  remote controller kit*
   Communication cable
 510U (T-D2U) model only
Qty: 1Qty: 1Qty: 1
*Refer to p. 10 and 22.
9009069005
(TM-RE42)  
						

							10   Page
2. Direct-vent conversion kit: 9007667005
   (TK-TV10)
This kit can be used 
to convert the water 
heater from a single 
vent system to a direct-
vent (double vent) (or 
sealed combustion) 
system with a 3 in. (76 mm) intake.  Install this 
conversion kit in accordance with the installation 
instructions and any applicable codes.
The pipe cover protects the plumbing 
pipes to the water heater from 
unexpected adjustments. This pipe 
cover is fixed to the bottom of the 
water heater, which hides the plumbing 
and improves the visual aspects of the 
whole installation for the water heater.
4. Recess box: 9007674005 (TK-RB02)
The recess box will allow for “clean” 
installations.  The water heater 
fits inside the recess box, which 
hides and protects the whole water 
heater and plumbing.  The recess 
box will fit in-between most wall 
studs.
1. 4” Backflow preventer and F-F adaptor: 
9007996005
There are two functions available for this 
adaptor, which can be connected with the 
water heater and NovaVent venting line 
and prevents the backflow of air through 
the exhaust vent.  This helps prevent 
harmful exhaust gases from entering the 
home, as well as helping to prevent the 
unit from freezing in areas where cold 
air can be blown or drawn into the exhaust system.  
Install this adaptor in accordance with the installation 
instructions that are packaged with the adaptor and 
any applicable codes.
5. Sidewall vent terminator (Hood) and Wall thimble:
Used when terminating direct-vent (sealed combustion) systems, with indoor 
models that require a 3 in. intake and a 4 in. exhaust.  This concentric 
termination provides the convenience of only having to make one penetration 
through a sidewall instead of two separate penetrations for the intake and 
exhaust piping.  The termination includes a bird screen, restricting small animals, pests, and foreign 
objects from entering into the vent system.  This sidewall termination is available in two different sizes, 
to cover a wide range of wall thicknesses.  For different wall thicknesses,there are two ranges of lengths 
available. (Refer to the NovaVent brochure for details.)
Installation
Installation Manual
Covering wall thicknessesPart#
Terminator Hood9007999005
Wall Thimble 4 - 7 in.9008345005
Wall Thimble 5 - 10 in.9008346005
Termination + Thimble 4 - 7 in.9008004005
Termination + Thimble 5 - 10 in.9008005005
3. Pipe cover: 9007670005 (TK-PC01)
Covering wall thicknessesPart#
5.0 – 10.0 in.9008147005 
 12.0 – 18.0 in.9008148005
6. Direct-vent concentric termination:
They are used when venting out through the wall.  These terminations are special stainless steel vents 
for gas appliances and are UL listed as Category II, III and IV.  For different wall thicknesses, there are two 
ranges of lengths available. (Refer to the NovaVent brochure for details.)  Install these vent terminations 
in accordance with their installation instructions and any applicable local codes.
Wall ThimbleTerminator Hood
7. Remote controller for high temperature mode: 9008172005 (TM-RE40)
This remote controller is for the 510U (T-D2U) and can supply higher temperatures than 
the 9009069005 (TM-RE42) that comes with the heater.